Troubleshooting Guide

Please review the troubleshooting steps below or search the knowledge base for common questions.

Common Troubleshooting Questions Testing Guide

Before you start

Quick facts

If the car has the valves open already when the controller is OFF, they will not move when the controller is switched ON.

The controller will keep them open when ON.

When OFF, the car is in control again, and the valves will still be open.

The controller remembers its last setting (ON or OFF), automatically restoring it the next time you start the car (how it works).

*This applies to orders as of 11 June 2026. Orders prior to this date do not have the memory function (more info).

The remote will show a red light when pressing either button.

If it does not, the batteries will need to be replaced.

Even in these modes the valves are not always open. The valves close in certain RPMs, throttle positions, speeds, gears etc.

The valves can be open while the car is stationary in the "loud" modes, however as you drive they close.

The controller will prevent the valves from closing.

If the car is not fully powered off during the installation process it may store an error or create a CEL (FAQ).

For certain Mercedes-Benz models *as noted on the product page*, the controller works slightly differently:

1. The controller takes 5 seconds for the valves to open after pressing the controller ON button.

2. The valves require a new signal from the car to close after turning the controller off. Either from changing the drive modes or throttle input.

Click here for more details

View all FAQ

Step by step

Troubleshooting Steps

Make sure the valve/s are CLOSED to begin.

  1. Check install

    First thing is to double check the controllers are fully connected with the locking tabs pushed in.

    If they are loose and not clicked in they can lose connection or let water in and damage them.

  2. Remote

    If the red light on the remote does not show when pressing either button:

    • Try the remote right next to the controllers to check if the batteries are low and it is a low power signal issue.
    • You will need to replace the batteries.

  3. If BOTH valves do not open

    Then it is most likely the remote.

    The controllers work independently, so it is very unlikely both to not work.

    Please follow the Controller Check Steps below.

    Controller Check Steps

  4. If ONE valve does not open

    But the other one does, then the controller can be the source.

    Review the Controller Check Steps below.

    Controller Check Steps

  5. Inspect for damage

    Inspect the controller units for damage, including the wires and connectors.

If a valve won't open

Controller Check Steps

  1. Check Connection

    Make sure the connectors are fully seated with the locking tabs pushed in.

  2. Check Actuator

    With the controller OFF, the car will open and close the valve when changing drive modes etc.

    • Remove the controller and check if the valve opens and closes.
    • Reinstall the controller and check again while it is OFF.

  3. If valve does not move

    It means the controller is not connected properly, please check again.

    Or there is another problem with the valve / actuator (not the controller) that needs to be sorted first.

  4. Valve does move when OFF

    Then the controller could be the problem.

    • Swap the controller to the other side and test again.
    • If the problem carries over then it is the controller. Please fill out the Warranty Claim Form here.
    • If it does not carry over, then the valve / actuator is the problem.
    Warranty Claim Form

Still not working?

After reviewing this guide, performing these 3 tests and reviewing the knowledge base, please fill out the Warranty Claim Form below.

Complete Warranty Claim Form